Examine source code of addon

{
  "name": "addon",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "d.png"
    },
    "colors": {
      "frame": "rgba(29, 30, 31, 1)",
      "tab_background_text": "rgba(122, 6, 6, 1)",
      "toolbar": "rgba(0, 0, 0, 1)",
      "bookmark_text": "rgba(255, 0, 0, 1)",
      "toolbar_field": "rgba(18, 17, 17, 1)",
      "toolbar_field_text": "rgba(150, 46, 46, 1)",
      "tab_line": "rgba(3, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b2f1d53a-7f8f-44f8-ae26-49096179874a}"
    }
  }
}